South Korea were forced to deploy troops as 86 cases of norovirus have been confirmed

Now the total has been taken to 86 with the opening ceremony due to take place on Friday.

A statement said: “The military personnel … will be responsible for security checks of the 20 venues as they take up jobs such as security searches, previously done by civilian safety personnel, until the patients’ condition is normalized.

All the civilian guards were said to be in a stable condition with no athletes among those effected.

Staff were confined to their rooms as the vomiting bug, which can be fatal among the elderly and vulnerable, struck in South Korea.

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The Korean Center for Disease Control and Prevention (KCDC) said all the cases were confined to the same building and the rest of the accommodation sites were being tested and disinfected.

The KCDC said: “KCDC dispatched an immediate response team to the Pyeongchang site to check additional people for symptoms, check the origin of the exposure, take measures to control infection and prevent spread.”

WINTER OLYMPICSWhat time is the Winter opening ceremony? The 2018 PyeongChang Winter Olympics are set to start on Thursday

Any further outbreaks could cause havoc with the schedule for the Games with Great Britan sending 59 athletes.

The Winter Olympics kicks off on Friday and will go on until the 25th of February.